.square{
    width: 30px;
    height: 30px;
    display: flex;
    justify-content: space-around;
    align-items: center;
    position: relative;
}
.zi{
    display: inline-block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    z-index: 3;
}
.black{
    z-index: 10;
    background-image: radial-gradient(rgb(219, 219, 219),rgb(136, 136, 136)  ,#000 50%);
    background-color: #000;
}
.white{
    background-image: radial-gradient(#fff 30%,rgb(214, 214, 214) 70%,rgb(204, 204, 204) 90%);
    z-index: 10;
}
.su{
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 1px;
    background-color: #000;
    z-index: 1;
}
.heng{
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    background-color: #000;
    height: 1px;
    z-index: 1;
}
.success{
    outline: 2px solid rgba(255, 0, 0, 0.384);
}